Can someone explain this to me and tell me the answer please?

Last one: y = -6x-1

Step-by-step explanation:

If you graph the point (-1,5) and go down 6, right 1, the y-intercept will be at -1. That is what -1 represents. The slope of -6 is in the coefficient for x. Therefore, the answer is y = -6x - 1. Hope this helped.

x^2 + 81

we can factor this using difference of square binomials.

rewrite the equation:

x^2 - (-81)

factor:

(a^2 - b^2) = (√a^2 + √b^2)(√a^2 - √b^2)

(x^2 - (-81) = (x + √-81)(x - √-81)

we can remove the - from under the radical by multiplying it by i.

(x^2 - (-81) = (x + i√81)(x - i√81)

(x^2 - (-81) = (x + 9i)(x - 9i)

we can check our answer by using foil:

x^2 - 9ix + 9ix - 81i^2

x^2 - 81^2

i^2 = -1

x^2 + 81

im super bad at school but u for some reason need to have points to ask questions and you get points by answering so thats all im doing sorry for t r o l l i n g  

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